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