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