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