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