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