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