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