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