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