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