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