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