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