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