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)(17,18,20,24,21,23,28,31)(19,25,27,32,26,22,29,30)(1,3)(2,7)(4,11)(5,14)(6,12)(8,15)(9,16)(10,13)(17,19,21,26)(18,22,23,25)(20,27,28,29)(24,32,31,30)(1,4,6,5)(2,8,9,13)(3,11,12,14)(7,15,16,10)(19,26)(22,25)(27,29)(30,32)(18,23)(20,28)(22,25)(27,29) 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.