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