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