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