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