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