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