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