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