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