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