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