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