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