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