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