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