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