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