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