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