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