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