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