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