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