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