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