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