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