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