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