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