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