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