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