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