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