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