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