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