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