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