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