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