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