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