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