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