One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,10)(4,8)(5,14)(6,9)(7,12)(11,16)(13,15)(17,18,22,28,23,27,42,51,24,29,43,52,21,40,41,66)(19,25,32,46,33,45,60,70,34,47,61,71,31,58,59,77)(20,35,38,63,39,49,65,72,36,62,64,78,37,26,48,50)(30,53,56,74,57,68,76,79,54,73,75,80,55,44,67,69)(1,3)(2,7)(4,13)(5,11)(6,12)(8,16)(9,10)(14,15)(17,19,22,32,23,33,42,60,24,34,43,61,21,31,41,59)(18,25,28,46,27,45,51,70,29,47,52,71,40,58,66,77)(20,30,38,56,39,57,65,76,36,54,64,75,37,55,48,67)(26,44,50,69,35,53,63,74,49,68,72,79,62,73,78,80)(1,4,6,5)(2,8,9,14)(3,11,12,13)(7,15,10,16)(17,20,21,37,24,36,23,39)(18,26,27,35,29,49,40,62)(19,30,31,55,34,54,33,57)(22,38,41,48,43,64,42,65)(25,44,45,53,47,68,58,73)(28,50,51,63,52,72,66,78)(32,56,59,67,61,75,60,76)(46,69,70,74,71,79,77,80)(1,5,6,4)(2,8,9,14)(3,11,12,13)(7,16,10,15)(20,36)(26,49)(30,54)(35,62)(37,39)(38,64)(44,68)(48,65)(50,72)(53,73)(55,57)(56,75)(63,78)(67,76)(69,79)(74,80)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.