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