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