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