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