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