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