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)(15,17)(16,23)(18,20)(19,25)(21,26)(22,27)(24,28)(1,2)(3,4)(5,7,9,8)(6,10,12,11)(13,15,17,14)(16,23,24,28)(18,21,26,20)(19,27,22,25)(5,7,9,8)(6,11,12,10)(13,16)(14,19)(15,22)(17,24)(18,27)(20,23)(21,28)(25,26)(2,4)(14,20)(15,21)(18,26)(19,23)(22,28)(25,27) involution — undirected(5,8,9,7)(6,11,12,10)(14,15)(16,24)(20,21)(25,27)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.