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