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)(20,26)(21,36)(22,28)(23,27)(24,29)(30,38)(31,40)(32,39)(33,41)(34,42)(35,43)(37,46)(44,47)(45,48) involution — undirected(1,3,4,8)(2,5,6,7)(10,13)(14,15)(17,19,30,44,21,20,34,45,24,33,22,32,23,31,37,35)(18,25,38,47,36,26,42,48,29,41,28,39,27,40,46,43)(10,13)(14,15)(17,20,24,31)(18,26,29,40)(19,23,33,21)(22,32,30,44)(25,27,41,36)(28,39,38,47)(34,35,37,45)(42,43,46,48)(2,6)(5,7)(9,11,12,16)(10,14,13,15)(17,21,24,23)(18,27,29,36)(19,31,33,20)(22,37,30,34)(25,26,41,40)(28,42,38,46)(32,45,44,35)(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.