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