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