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