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