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