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