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)(17,18,23,25)(19,27,28,31)(20,30,24,29)(21,26,22,32)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19,23,28)(18,24,25,20)(21,30,22,29)(26,31,32,27)(11,15)(13,16)(17,20,23,24)(18,19,25,28)(21,31,22,27)(26,29,32,30)(10,14)(13,16)(18,25)(19,28)(26,32)(29,30) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,23,22)(18,26,25,32)(19,29,28,30)(20,31,24,27)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.