One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,12)(4,9)(5,8)(6,15)(7,11)(10,13)(14,16)(17,18,20,25,22,26,21,24)(19,27,31,29,32,28,30,23)(1,3,7,13)(2,8,11,16)(4,5,6,14)(9,10,15,12)(17,19,22,32)(18,23,26,29)(20,31,21,30)(24,28,25,27)(1,4,7,6)(2,9,11,15)(3,5,13,14)(8,10,16,12)(17,18)(19,28)(20,24)(21,25)(22,26)(23,30)(27,32)(29,31)(1,5,7,14)(2,10,11,12)(3,4,13,6)(8,9,16,15)(17,18)(19,29)(20,25)(21,24)(22,26)(23,32)(27,30)(28,31)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.