One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,7)(6,8)(9,10)(11,15)(12,14)(13,16)(17,18)(19,25)(20,24)(21,26)(22,27)(23,29)(28,40)(30,43)(31,48)(32,41)(33,42)(34,44)(35,38)(36,45)(37,46)(39,47) involution — undirected(1,3)(2,6)(4,7)(5,8)(9,11)(10,13)(12,16)(14,15)(17,19,21,29)(18,23,26,25)(20,31,32,47)(22,35,34,30)(24,39,41,48)(27,43,44,38)(28,36,46,33)(37,45,40,42)(10,14)(13,15)(17,20,21,32)(18,24,26,41)(19,28,29,46)(22,36,34,33)(23,37,25,40)(27,45,44,42)(30,47,35,31)(38,48,43,39)(2,7)(3,8)(11,16)(13,15)(17,19)(18,25)(20,28)(21,29)(22,30)(23,26)(24,40)(27,43)(31,33)(32,46)(34,35)(36,47)(37,41)(38,44)(39,45)(42,48) involution — undirected(1,4,5,6)(2,3,7,8)(19,29)(23,25)(28,46)(30,35)(31,47)(37,40)(38,43)(39,48)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.