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)(11,14)(12,13)(15,16)(17,18,21,26)(19,29,32,24)(20,25,23,28)(22,27,30,38)(31,41,34,39)(33,45,46,40)(35,42,37,44)(36,48,47,43)(1,3,4,8)(2,5,6,7)(17,19,30,46,20,34,37,36,21,32,22,33,23,31,35,47)(18,24,38,45,25,41,44,43,26,29,27,40,28,39,42,48)(10,13)(14,16)(17,19,21,32)(18,24,26,29)(20,31,23,34)(22,36,30,47)(25,39,28,41)(27,43,38,48)(33,35,46,37)(40,42,45,44)(2,6)(5,7)(9,11,12,15)(10,14,13,16)(17,20,21,23)(18,25,26,28)(19,31,32,34)(22,35,30,37)(24,39,29,41)(27,42,38,44)(33,36,46,47)(40,43,45,48)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.