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