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