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