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)(17,18,23,27,22,21,26,32)(19,24,20,29,28,31,30,25)(1,3,6,2)(4,7,5,8)(9,11)(10,13)(12,15)(14,16)(17,19)(18,24)(20,23)(21,31)(22,28)(25,32)(26,30)(27,29)(10,14)(11,15)(17,20)(18,25)(19,26)(21,29)(22,30)(23,28)(24,27)(31,32) involution — undirected(1,4,6,5)(2,7,3,8)(10,14)(13,16)(17,21,23,32,22,18,26,27)(19,24,20,29,28,31,30,25)(1,5,6,4)(2,7,3,8)(19,28)(20,30)(24,31)(25,29)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.