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