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