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