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)(17,18,21,23)(19,27,30,24)(20,25,31,35)(22,26,33,36)(28,37,34,39)(29,41,44,38)(32,40,45,46)(42,47,43,48)(1,3)(2,6)(4,7)(5,8)(9,11,12,15)(10,13,14,16)(18,23)(19,28)(20,31)(22,33)(24,37)(27,39)(29,43)(30,34)(38,48)(40,46)(41,47)(42,44)(10,14)(13,16)(17,19,21,30)(18,24,23,27)(20,29,31,44)(22,34,33,28)(25,38,35,41)(26,37,36,39)(32,43,45,42)(40,47,46,48)(2,7)(3,8)(10,14)(13,16)(17,20)(18,25)(19,29)(21,31)(22,32)(23,35)(24,38)(26,40)(27,41)(28,42)(30,44)(33,45)(34,43)(36,46)(37,47)(39,48) involution — undirected(1,4,5,6)(2,3,7,8)(18,23)(19,30)(20,31)(26,36)(28,34)(32,45)(38,41)(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.