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