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