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