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