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