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