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)(25,32)(29,43)(30,37)(31,42)(33,40)(34,38)(35,41)(39,44)(45,48)(46,47) 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)(28,42)(39,47)(40,41)(43,48)(11,15)(13,16)(17,19,23,32,22,31,21,30)(18,25,27,28,24,37,36,42)(20,29,33,44,34,45,35,46)(26,39,41,43,38,47,40,48)(1,4,5,3)(2,6,7,8)(11,15)(13,16)(17,20,22,34)(18,26,24,38)(19,29,31,45)(21,35,23,33)(25,39,37,47)(27,41,36,40)(28,43,42,48)(30,46,32,44)(10,14)(13,16)(17,21,22,23)(18,27,24,36)(19,30,31,32)(20,33,34,35)(25,28,37,42)(26,40,38,41)(29,44,45,46)(39,48,47,43)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.