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