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