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