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