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