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