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