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