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