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