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