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)(15,19)(16,18)(17,20)(21,22)(23,30)(24,28)(25,33)(26,29)(27,31)(32,35)(34,36) involution — undirected(1,2)(3,4)(6,11)(8,9)(12,18)(13,14)(15,16)(19,20) involution — undirected(2,4)(5,7,10,17)(6,12,14,20)(8,15,9,16)(11,18,13,19)(21,23,26,32)(22,27,29,36)(24,31,25,34)(28,35,33,30)(5,8)(7,15)(9,10)(11,13)(16,17)(18,19)(21,24,26,25)(22,28,29,33)(23,31,32,34)(27,35,36,30)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.