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