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