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