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