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