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