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