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