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