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