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)(11,15)(12,16)(13,14)(17,18,22,26)(19,28,30,23)(20,32,33,41)(21,25,36,27)(24,34,40,35)(29,43,45,48)(31,39,47,38)(37,46,42,44)(2,6)(7,8)(10,14)(11,12)(17,19)(18,23)(20,29)(21,31)(22,30)(24,37)(25,38)(26,28)(27,39)(32,48)(33,45)(34,44)(35,46)(36,47)(40,42)(41,43) involution — undirected(1,3,5,4)(2,7,6,8)(9,11,13,12)(10,15,14,16)(17,20,21,35,22,33,36,34)(18,24,27,32,26,40,25,41)(19,29,31,46,30,45,47,44)(23,37,39,48,28,42,38,43)(1,4,5,3)(2,8,6,7)(11,12)(15,16)(19,30)(20,33)(23,28)(24,40)(31,47)(32,41)(34,35)(38,39)(9,12,13,11)(10,16,14,15)(17,21,22,36)(18,25,26,27)(19,31,30,47)(20,34,33,35)(23,38,28,39)(24,32,40,41)(29,44,45,46)(37,48,42,43)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.