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