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