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