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