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