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)(19,27)(20,31)(21,23)(22,36)(24,30)(25,32)(26,35)(28,43)(29,41)(33,42)(34,40)(37,46)(38,48)(39,45)(44,47) involution — undirected(1,3,7,4)(2,5,8,6)(9,10)(11,15)(12,14)(13,16)(18,23)(20,32)(24,37)(26,36)(27,41)(28,33)(34,44)(45,48)(1,4,7,3)(2,5,8,6)(9,11)(10,13)(12,16)(14,15)(17,19,22,30,21,29,35,46)(18,24,26,27,23,37,36,41)(20,33,34,48,32,28,44,45)(25,39,40,43,31,38,47,42)(1,5,7,6)(2,3,8,4)(11,16)(13,15)(17,20)(18,25)(19,28)(21,32)(22,34)(23,31)(24,38)(26,40)(27,42)(29,33)(30,45)(35,44)(36,47)(37,39)(41,43)(46,48)(1,6,7,5)(2,3,8,4)(10,14)(13,15)(20,32)(25,31)(28,33)(34,44)(38,39)(40,47)(42,43)(45,48)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.