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