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