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