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