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