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