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)(17,18,22,26,21,24,30,32)(19,23,25,31,27,20,28,29)(1,3,4,7)(2,5,6,8)(9,10,13,14)(11,15,12,16)(17,19,21,27)(18,23,24,20)(22,25,30,28)(26,31,32,29)(2,6)(5,8)(9,11,13,12)(10,15,14,16)(18,24)(19,27)(25,28)(26,32)(10,14)(15,16)(19,27)(20,23)(25,28)(29,31) involution — undirected(9,12,13,11)(10,16,14,15)(17,20,22,29,21,23,30,31)(18,25,26,27,24,28,32,19)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.