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