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