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