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)(11,14)(12,13)(15,16)(17,18,21,25)(19,27,31,23)(20,32,33,24)(22,26,35,40)(28,38,30,36)(29,37,44,41)(34,45,46,39)(42,47,43,48)(10,13)(11,15)(17,19)(18,23)(20,29)(21,31)(22,28)(24,37)(25,27)(26,36)(30,35)(32,41)(33,44)(34,42)(38,40)(39,47)(43,46)(45,48) involution — undirected(2,6)(7,8)(9,11,12,15)(10,14,13,16)(19,28)(20,33)(22,35)(23,36)(24,32)(26,40)(27,38)(29,43)(30,31)(37,48)(41,47)(42,44)(1,3,5,4)(2,7,6,8)(10,13)(14,16)(17,20,21,33)(18,24,25,32)(19,29,31,44)(22,34,35,46)(23,37,27,41)(26,39,40,45)(28,42,30,43)(36,47,38,48)(1,4,5,3)(2,8,6,7)(19,30)(22,35)(23,38)(26,40)(27,36)(28,31)(29,43)(34,46)(37,48)(39,45)(41,47)(42,44)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.