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