One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,8)(17,18)(19,29)(20,26)(21,35)(22,27)(23,38)(24,31)(25,34)(28,37)(30,40)(32,41)(33,44)(36,43)(39,48)(42,46)(45,47) involution — undirected(2,6)(4,7)(9,10)(11,15)(12,14)(13,16)(17,19)(18,24)(20,33)(21,30)(22,31)(23,32)(25,42)(26,40)(27,29)(28,41)(34,48)(35,44)(36,46)(37,47)(38,45)(39,43) involution — undirected(1,3)(2,7)(4,6)(5,8)(9,11)(10,13)(12,16)(14,15)(17,20,22,21)(18,25,27,43)(19,30,31,33)(23,36,37,34)(24,39,29,42)(26,28,35,38)(32,48,47,46)(40,45,44,41)(2,6)(3,8)(11,16)(13,15)(17,21,22,20)(18,26,27,35)(19,30,31,33)(23,36,37,34)(24,40,29,44)(25,28,43,38)(32,46,47,48)(39,45,42,41)(1,4,5,7)(2,3,6,8)(10,14)(13,15)(20,21)(25,43)(26,35)(30,33)(34,36)(39,42)(40,44)(46,48)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.