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