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