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