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