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