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