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