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