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