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