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