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)(12,13)(14,16)(18,22)(19,26)(20,28)(23,31)(27,30)(29,32) involution — undirected(1,3,5,4)(2,6,8,7)(9,10)(11,14)(12,13)(15,16)(17,18,21,22)(19,27,29,31)(20,24,28,25)(23,32,30,26)(1,3,5,4)(2,7,8,6)(10,13)(14,15)(17,19,20,26,21,29,28,32)(18,23,25,27,22,30,24,31)(1,4,5,3)(2,6,8,7)(9,11,12,16)(10,14,13,15)(17,19,28,32,21,29,20,26)(18,23,24,31,22,30,25,27)(2,8)(6,7)(17,20,21,28)(18,24,22,25)(19,26,29,32)(23,31,30,27)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.