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