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