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