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