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