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