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