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