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