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