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