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