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