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