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