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