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)(17,18,20,23,21,24,28,31)(19,25,27,32,26,22,29,30)(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)(19,26)(22,25)(27,29)(30,32)(10,14)(15,16)(19,26)(22,25)(27,29)(30,32) involution — undirected(9,12,13,11)(10,16,14,15)(17,19,20,27,21,26,28,29)(18,22,23,30,24,25,31,32)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.