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