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