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