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