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