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