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