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