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)(19,28,31,38)(20,25,32,40)(21,26,22,36)(24,34,39,30)(29,43,44,48)(33,41,35,42)(37,45,47,46)(1,3)(2,5)(4,8)(6,7)(9,11)(10,13)(12,16)(14,15)(20,32)(25,40)(29,44)(33,35)(37,47)(41,42)(43,48)(45,46) involution — undirected(1,2)(3,5)(4,6)(7,8)(11,16)(13,15)(17,19,21,34,23,31,22,30)(18,24,36,38,27,39,26,28)(20,29,35,45,32,44,33,46)(25,37,41,48,40,47,42,43)(2,6)(5,7)(10,14)(13,15)(17,20,23,32)(18,25,27,40)(19,29,31,44)(21,35,22,33)(24,37,39,47)(26,42,36,41)(28,43,38,48)(30,46,34,45)(3,8)(5,7)(17,21,23,22)(18,26,27,36)(19,30,31,34)(20,33,32,35)(24,38,39,28)(25,41,40,42)(29,45,44,46)(37,43,47,48)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.