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