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