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