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