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)(11,15)(12,14)(13,16)(18,23)(24,29)(25,30)(31,32) involution — undirected(1,3)(2,6)(4,7)(5,8)(9,11)(10,13)(12,16)(14,15)(18,24)(20,22)(23,29)(25,31)(26,28)(30,32) involution — undirected(10,14)(13,15)(17,18,21,23)(19,25,27,30)(20,24,22,29)(26,32,28,31)(2,7)(3,8)(11,16)(13,15)(17,19)(18,25)(20,28)(21,27)(22,26)(23,30)(24,31)(29,32) involution — undirected(1,4,5,6)(2,3,7,8)(17,20,21,22)(18,24,23,29)(19,26,27,28)(25,32,30,31)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.