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