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