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