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