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