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