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