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