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