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