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