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