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