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