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