One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,9,16)(3,17,23,73)(4,24,31,65)(5,32,38,69)(6,39,42,14)(7,43,41,13)(8,46,34,15)(10,48,53,19)(11,40,59,27)(12,60,64,37)(18,74,79,117)(20,72,44,109)(21,71,84,122)(22,85,47,61)(25,89,83,121)(26,92,98,118)(28,57,45,58)(29,56,30,67)(33,68,105,52)(35,87,99,62)(36,63,100,102)(49,93,113,126)(50,90,66,81)(51,104,108,80)(54,103,115,127)(55,95,120,107)(70,82,124,76)(75,111,110,114)(77,125,78,116)(86,128,112,91)(88,97,123,96)(94,101,106,119)(1,3,9,23)(2,10,16,53)(4,25,31,83)(5,33,38,105)(6,21,42,84)(7,44,41,20)(8,47,34,22)(11,54,59,115)(12,61,64,85)(13,51,43,108)(14,66,39,50)(15,68,46,52)(17,69,73,32)(18,45,79,28)(19,60,48,37)(24,86,65,112)(26,93,98,126)(27,78,40,77)(29,76,30,82)(35,104,99,80)(36,90,100,81)(49,67,113,56)(55,117,120,74)(57,111,58,114)(62,122,87,71)(63,109,102,72)(70,123,124,88)(75,106,110,94)(89,118,121,92)(91,97,128,96)(95,103,107,127)(101,116,119,125)(1,4,5,26,34,30,60,97,9,31,38,98,8,29,37,96)(2,11,12,55,46,58,69,119,16,59,64,120,15,57,32,101)(3,18,19,75,47,78,105,127,23,79,48,110,22,77,33,103)(6,40,35,106,7,45,36,107,42,27,99,94,41,28,100,95)(10,49,17,70,68,86,85,89,53,113,73,124,52,112,61,121)(13,65,62,123,14,67,63,92,43,24,87,88,39,56,102,118)(20,82,80,93,84,25,90,91,44,76,104,126,21,83,81,128)(50,114,71,117,108,54,109,116,66,111,122,74,51,115,72,125)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.