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