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