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