One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,9,16)(3,17,23,70)(4,24,31,87)(5,32,38,66)(6,14,39,63)(7,40,41,13)(8,42,34,15)(10,44,49,19)(11,50,56,27)(12,57,61,37)(18,71,77,126)(20,69,80,122)(21,81,82,68)(22,83,43,58)(25,88,91,121)(26,92,98,118)(28,55,72,54)(29,53,30,86)(33,65,103,48)(35,59,104,106)(36,60,105,100)(45,93,111,127)(46,79,64,108)(47,102,62,78)(51,113,116,101)(52,117,120,95)(67,90,124,74)(73,109,107,115)(75,114,76,125)(84,128,110,89)(85,97,123,96)(94,99,112,119)(1,3,9,23)(2,10,16,49)(4,25,31,91)(5,33,38,103)(6,21,39,82)(7,20,41,80)(8,43,34,22)(11,51,56,116)(12,58,61,83)(13,62,40,47)(14,64,63,46)(15,65,42,48)(17,66,70,32)(18,72,77,28)(19,57,44,37)(24,84,87,110)(26,93,98,127)(27,75,50,76)(29,74,30,90)(35,102,104,78)(36,79,105,108)(45,86,111,53)(52,71,120,126)(54,115,55,109)(59,81,106,68)(60,69,100,122)(67,123,124,85)(73,94,107,112)(88,118,121,92)(89,97,128,96)(95,101,117,113)(99,114,119,125)(1,4,5,26,34,30,57,97,9,31,38,98,8,29,37,96)(2,11,12,52,42,55,66,119,16,56,61,120,15,54,32,99)(3,18,19,73,43,76,103,113,23,77,44,107,22,75,33,101)(6,27,35,94,41,72,105,117,39,50,104,112,7,28,36,95)(10,45,17,67,65,84,83,88,49,111,70,124,48,110,58,121)(13,24,59,85,14,53,60,118,40,87,106,123,63,86,100,92)(20,74,78,127,82,91,108,128,80,90,102,93,21,25,79,89)(46,109,68,71,47,51,69,114,64,115,81,126,62,116,122,125)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.