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