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