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