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