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)(21,34)(22,26)(23,29)(24,32)(25,35)(28,41)(30,39)(33,45)(36,44)(37,43)(38,46)(40,42)(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)(25,27,34,39)(31,40,45,47)(32,42)(33,43)(35,44)(46,48)(1,3,5,13)(2,8,10,16)(4,12,6,14)(7,15,11,9)(23,36)(27,39)(37,41)(40,47)(1,4,5,6)(2,9,10,15)(3,12,13,14)(7,16,11,8)(17,20,21,32,22,33,35,46)(18,24,25,31,26,38,34,45)(19,28,29,42,30,43,44,48)(23,37,27,40,36,41,39,47)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.