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