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