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