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