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