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