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