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