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