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