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