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