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