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