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)(19,30)(20,32)(21,26)(22,27)(23,28)(24,29)(25,31) involution — undirected(1,3,5,4)(2,6,8,7)(9,10)(11,14)(12,13)(15,16)(17,19,22,31,24,20,23,26)(18,25,28,30,29,21,27,32)(1,3,5,4)(2,7,8,6)(10,13)(14,16)(17,20,22,26,24,19,23,31)(18,25,28,30,29,21,27,32)(1,4,5,3)(2,6,8,7)(9,11)(10,14)(12,15)(13,16)(17,21,24,25)(18,26,29,31)(19,27,20,28)(22,32,23,30)(11,15)(14,16)(17,22,24,23)(18,27,29,28)(19,31,20,26)(21,30,25,32)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.