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