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