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