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