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