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