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