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