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