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