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