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