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