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