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