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