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