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