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