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