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