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