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