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)(24,27,34,28)(26,33,35,31)(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)(21,23,25,32)(22,26,29,35)(24,33,34,31)(27,30,28,36)(5,8,9,18)(6,13,14,20)(7,15,10,17)(11,16,12,19)(22,27)(24,34)(26,30)(28,29)(31,33)(35,36)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.