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