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