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