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