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