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