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