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