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