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)(11,15)(17,18)(19,24)(20,29)(21,25)(22,32)(23,26)(27,31)(28,30) involution — undirected(2,5)(3,7)(9,10)(11,14)(12,13)(15,16)(17,19,23,27)(18,24,26,31)(20,25,30,32)(21,28,22,29)(10,13)(14,16)(17,20,22,24,23,30,21,31)(18,19,25,29,26,27,32,28)(2,5)(6,8)(9,11,12,15)(10,14,13,16)(19,27)(20,30)(24,31)(28,29)(1,3,4,7)(2,6,5,8)(17,21,23,22)(18,25,26,32)(19,28,27,29)(20,24,30,31)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.