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