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