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