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