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)(11,15)(12,13)(14,16)(17,18)(19,26)(20,30)(21,25)(22,24)(23,29)(27,28)(31,32) involution — undirected(10,13)(11,16)(17,19)(18,23)(20,28)(21,29)(22,31)(24,27)(25,26)(30,32) involution — undirected(2,5)(6,8)(9,11,12,16)(10,14,13,15)(17,18)(19,27)(20,24)(21,25)(22,30)(23,31)(26,28)(29,32)(1,3,4,7)(2,6,5,8)(10,13)(14,15)(17,20,21,22)(18,24,25,30)(19,28,29,31)(23,27,26,32)(17,20)(18,24)(19,29)(21,22)(25,30)(27,32) 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.