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