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