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