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