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