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