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