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