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