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