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