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