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