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