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