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