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