One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,12)(8,13)(9,11)(10,14)(15,18)(16,20)(17,19)(21,22)(23,30)(24,28)(25,34)(26,29)(27,32)(31,35)(33,36) involution — undirected(1,2)(3,4)(6,11)(8,9)(12,18)(13,14)(15,17)(19,20) involution — undirected(2,4)(5,7)(6,12)(8,17)(9,15)(10,16)(11,18)(13,19)(14,20)(21,23,26,33)(22,27,29,35)(24,32,25,31)(28,36,34,30)(5,8,10,9)(6,13,14,11)(7,15,16,17)(12,18,20,19)(21,24,26,25)(22,28,29,34)(23,31,33,32)(27,30,35,36)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.