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