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