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