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