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