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