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