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