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