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