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