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