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