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