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