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