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