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