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