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