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