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