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