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