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