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