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