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