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)(11,13)(12,14)(15,16)(17,18,22,26)(19,23,28,36)(20,30,33,45)(21,34,31,25)(24,38,39,32)(27,40,42,48)(29,44,41,37)(35,46,47,43)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19,22,28)(18,23,26,36)(20,27,33,42)(21,29,31,41)(24,35,39,47)(25,37,34,44)(30,40,45,48)(32,43,38,46)(11,15)(13,16)(17,20,31,38,22,33,21,32)(18,24,34,45,26,39,25,30)(19,27,41,46,28,42,29,43)(23,35,44,48,36,47,37,40)(10,14)(13,16) involution — undirected(1,3,4,7)(2,6,5,8)(19,28)(23,36)(27,42)(29,41)(35,47)(37,44)(40,48)(43,46)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.