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