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